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A Control Method of Dfig Shaft System Oscillation Based on Virtual Inertia Control

A technology of virtual inertia and control method, which is applied in the field of double-fed wind turbine grid-connected shaft system oscillation, can solve the problems such as the reduction of equivalent inertia of the power system, and achieve the effect of ensuring safe and stable operation

Active Publication Date: 2022-06-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The second point: the connection of large-scale wind farms to the grid will cause the problem of the reduction of the equivalent inertia of the power system. With the increase of the scale of wind farms, this problem becomes increasingly prominent

Method used

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  • A Control Method of Dfig Shaft System Oscillation Based on Virtual Inertia Control
  • A Control Method of Dfig Shaft System Oscillation Based on Virtual Inertia Control
  • A Control Method of Dfig Shaft System Oscillation Based on Virtual Inertia Control

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Embodiment

[0036] like figure 1 As shown, the present invention relates to a control method for DFIG shafting oscillation based on virtual inertia control, and the method includes the following steps:

[0037] Step 1. Build a linearized system model of a five-machine two-area system with a doubly-fed wind farm.

[0038] Step 2. Use the Lyapunov first method to obtain the static stable working point of the linearized system model, and obtain the shafting oscillation frequency, left / right eigenvectors and Characteristic property values ​​such as damping ratio.

[0039] For the ith pair of conjugate eigenvalues ​​λ i =σ i ±jω i , using its left and right eigenvectors and other characteristic attributes to conduct modal analysis to obtain the participation factor, and identify the shafting oscillation mode according to the participation factor.

[0040] Step 3: Introduce virtual inertia control into the linearized system model, change the value of virtual inertia control, and obtain the...

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Abstract

The present invention relates to a control method of DFIG shaft system oscillation based on virtual inertia control, comprising the steps of: S1: building a linearized system model including a doubly-fed wind farm; S2: obtaining the characteristic attribute value of the linearized system model, using the characteristic Obtain the participation factor for the conjugate characteristic root of the attribute value, and identify the vibration mode of the shaft system according to the participation factor; S3: Introduce virtual inertia control, change the value of the virtual inertia control parameter, and obtain the root of the vibration mode of the shaft system under different values The change trend of trajectory curve and damping ratio; S4: According to the change trend, obtain the suppression effect of the virtual inertia control parameters on the shafting oscillation of the doubly-fed fan within a certain range, adjust the appropriate virtual inertia control parameters, and realize an effective DFIG shafting Oscillation control. Compared with the prior art, the invention has the advantages of increasing the inertia of the power system, ensuring the safe and stable operation of the fan, and the like.

Description

technical field [0001] The invention relates to the technical field of grid-connected shafting oscillation of a doubly-fed fan, in particular to a control method of DFIG shafting oscillation based on virtual inertia control. Background technique [0002] In recent years, wind power, as a renewable clean energy, has developed rapidly due to its low power generation cost and abundant resource reserves. However, when large-scale wind farms are connected to the power grid, it will bring severe challenges to the safe and stable operation of the power grid. Among them, the first point is that the drive shaft system of the DFIG belongs to a flexible connection system. Under the small disturbance of wind speed, the dynamic process of the shaft system of the DFIG (Doubly Fed Induction Generator, DFIG) is presented in the form of oscillation. Reflected on the output power of the DFIG, because the oscillation frequency is low (about 2Hz), close to the frequency of the low-frequency os...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/24
CPCH02J3/386H02J3/24H02J3/48H02J2203/20Y02E10/76
Inventor 边晓燕刘洁杜中浩杨帅帅王振兴丁炀李东东
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER